.mj{
    width: 800px;
    height: 800px;
    background-color: antiquewhite;
    display: grid;
    /* grid-template-columns: 1fr 1fr 1fr 1fr; */
    /* 重复写 */
    /* grid-template-columns: repeat(5,1fr); */
    /* 一次性写 */
    grid-template-columns: repeat(auto-fill,minmax(150px,1fr));
    /* 响应式布局 */
    margin: 0 auto;
    gap: 30px;
}
.mj1{
    height: 120px;
    background-color: aqua;
    display: flex;
  
    
 text-align: center;


}